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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the structure of a conventional
speaker device, and FIGS. 2 and 3 are displacements of the cabinet when the diaphragm of the
bass speaker is pulled in and pushed out, respectively. FIG. 4 shows an embodiment of the
present invention. 1 ...... cabinet, 2 ...... tweeter, 3 ...... woofer, 4 ...... legs, 5,6 ...... Loudspeaker with
identical physical conditions.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a loudspeaker system. In the conventional speaker device, as shown in FIG. 1, a high-tone
speaker (2) and a bass speaker (3) are attached to the front of a cabinet (1). And, recently, in
order to extend playback to the low frequency while cabinets) + 11 are small in size, ■ extend
the weight of the speaker (3) for the bass speaker (3) in order to extend the scale, it is powerful
Since it is driven by a power amplifier, the low frequency speaker (the reaction of the vibrating
part at the time of driving is 3 cabinets) is shown as the whole vibration in 1-nl. As a result, the
cabinet il + (1) S-K 5.. The foot (4) on the bottom of the frame produces force oscillations as
shown in FIGS. FIG. 2 shows the cabinet (1) being tilted forward when the diaphragm of the low
frequency speaker (3) is drawn into the cabinet fl +, and FIG. 3 shows the low frequency speaker
(the diaphragm of 31 is the cabinet fi + The cabinet (1) is inclined rearward when pushed out.
Such vibration shook the floor on which the cabinets fn are placed, and if the record player is
placed on the floor, the vibration is transmitted to the record player and the super low of about
10 to 30 Hz. It causes intense oscillations in the area, making the audio system impractical. In
fact, when an audio system is used in a general home, such troubles often occur. The present
invention seeks to obtain a speaker device which does not generate the troubles as described
above. For this purpose, the present invention uses two of the speakers with the same physical
condition as the bass speaker, attaches them to the symmetrical position of the cabinet, and
drives them with the same phase ;: Z- '(2) It is a thing. FIG. 4 shows an embodiment of the present
invention, wherein (51 is a bass speaker mounted on the front of the cabinet + 11 with the high-
tone speaker (2), and (61 is a bass speaker + 51 on the rear of the cabinet (1) It is a speaker for
basses of the conditions physically the same as the speaker f51 for basss attached to the
symmetrical position, and these are electrically connected in the same phase. In this speaker
device, the reaction of the low frequency speakers (5) and (6) is opposite to each other and is
canceled out, so that no vibration is generated in the back of the cabinet. Note that since the
high-tone speaker (2) has small acoustic energy, it is related to the vibration of the cabinet 111,
and the acoustic radiation of the bass speakers i5 + and f61 is performed in the same phase with
respect to the space described above. , @ Will not cause problems on time.
As described above, according to the present invention, it is possible to obtain a speaker device
suitable for a general household audio system which has a simple structure and no cabinet
vibration. (3)□□